Manufacture of gilled tubular apparatus.



W. I. STILL.

MANUFACTURE OF GILLED TUBULAR APPARATUS.

APPLICATION FILED APR. II, I912.

Patented Feb. 15,1916.

2 SHEETSSHEET I.

W. L STILL.

MANUFACTURE OF GILLED TUBULAR APPARATUS.

APPLICATION FILED APR. 1|, 1912.

I 1,171,899. Patented Feb. 15,1916.

2 SHEETS-SHEET 2- .nnu... 4

, UNITED STATES PATENT OFFICE.

MANUFACTURE OF GILLED TUBULAR APPARATUS.

Specification of Letters Patent.

Patented Feb. 15, 1916.

Application filed April 11, 1912. Serial No. 690,212.

T 0 all whom it mag/concern Be it known that I, WILLIAM JOSEPH STILL, asubject of the King of Great Britain and Ireland, residing at Southall,in the county of Middlesex, England, have in vented Improvements in orRelating to the Manufacture of Grilled Tubular Apparatus, of which thefollowing is a specification.

This invention relates to the manufacture of that class of apparatus fortransmitting heat from one fluid to another which comprises flangedgills or plates secured exte- -riorly to a duct by expansion of thelatter into intimate contact with the gills or plates.

The object of the invention is to provide an improved method ofmanufacture which consists in first flaring the flanges at theirjunction with the gills, assembling the gills upon the tubes so that thefree ends of the flanges on one gill enter the flared portions of theflanges of another gill leaving annular jointing recesses or zonesaround the tubes, introducing a fusible mixture in powdered conditionbetween the gills when these are in a substantially horizontal position,vibrating the assembled parts so as to cause the fusible mixture tocreep into the jointing recesses or zones and thereafter applying heatto melt the fusible mixture.

In the accompanying drawings, Figure 1 is an elevation and Fig. 2 a planpartly in horizontal section, of one construction of apparatusconstructed according to the invention and comprising tubes and gills orplates secured thereto such apparatus being suitable for use as a waterheater. Fig. 3 is a sectional elevation of means for forming the holesin the plates to be secured to a duct. Fig. 4 is a view partly insection and more or less diagrammatic of a gilled tube and means to beused in its manufacture.

The apparatus shown in Figs. 1 and 2 comprises a number of tubes a.passing through and secured to a number of plates 6 arranged a shortdistance apart, thewhole forming I an apparatus suitable for heatingwater that is passed through the tubes 0. which, as well as the plates 6are heated by 'liot gas flowing upward through the passages between theplates.

The means shown in Fig. 3 for forming the holes in the plates Z7 for thereception of the tubes at, comprise a bolster f and a tool in the formof a punch g and stamp 72.. The

punch g has no companion sheer bed as ordinarily, the arrangement beingsuch that the plate is partly shaped before'the metal for the holeisremoved by the punch, which afterward takes place, the continuedmovement of the tool completing the shape, as will be understood fromthe said figure. In this way the flanged holes are made trumpet shape asshown. By the formation of the flanged holes in the manner described,when the several plates 6 are placed on the tubes a as shown in Fig. 2with the flanged edges 6 of the holes in one plate extending into thetrumpet shaped holes in an adjacent plate an annular recess or jointingzone 22 is formed between each flanged edge and the adjacent tubespecially adapted for the reception of-jointing material as hereinafterdescribed.

Heretofore in the manufacture of apparatus of the kind referred toembodying one or more tubes of thin metal expanded into the flangedholes of a number of gills or plates it has been customary to hold thetube at the end remote from that at which the expander commences totravel but according to the present invention that end only of the tubea (Fig. 1) or each tube in turn, at which the expansion commences, is,an chored to the corresponding end gill or plate I) of the set of gillsor plates to be secured to the tube and the resistance to the passage ofthe expander through the tube is transmitted through the flanged edges 6of the holes in the said set of, gills or plates in a longitudinaldirection by anchoring or rig-' idly supporting the opposite extreme endof such set. By this means the metal ofthe tube is always in tension andthe excess of themetal, due to elongation, is free to protrude beyondtheset of gills or plates while at the same time the flanged edges 6 ofthe holes in' the gills or plates 6 are pressed be expanded and thenscrewed into the rod of a hydraulic ram Zr: moved in operative directionby water supplied to the cylinder k through a valve m from a main at mand in the oppositedirection, when an exhaust n is opened, by the valve,by water that is displaced from the cylinder into a raisedtank orreceiver through a pipe 0 during the operation of the ram. In order toresist longitudinal movement of the tube. a while being expanded, theend of the tube may be upturned or flanged as shown at a to engage theouter plate I) the set of tubes and plates being supported against thepull of the expanding tool by a tubular distance piece 70 acting throughthe flanged edges 6 of the holes in the plates as shown. As will be seenby the arrangement described the tube will be gradually expanded alongits length when the spherical expanding devices are drawn through it.

After the lates and tubes have been assembled and rmly united bexpanding the tubes as described, the sol er and flux or brazing mixturepreferably used for uniting the parts together, may in some cases, as inapparatus shown in Figs. 1 and 2, and .after arranging the plateshorizontal, be placed in powdered condition between the plates in excessand the assembled plates and tubes subjected to a vibrating or shakingmotion so as to cause the powdered jointing material to fill therecesses or jointing zones 6 in the plates around each tube wherein itwill be retained, the vibrating or shaking motion being continued until,after shutting off the supply of the jointing material, the excessthereof is removed from. the plates after which heat is applied ,to meltthe jointing mixture and thereby A finally unite the plates and tubes.The melting of the solder and flux or brazing mixture may convenientlybe effected by connecting the tubes in series with a circuit ineludingan air heater and a fan and circulating heated air at a high velocitythrough the tubes.

What I claim is The herein described steps in the manufacture ofapparatus embodying tubes expanded into intimate contact with flangedgills, through which they extend, which consists in first flaring theflanges of the holes at their junction with the gills, assembling thegills upon the tubes so that the free ends of the flanges on one gillenter the flared pqrtions of the flanges of another gill leavingadjacent annular jointing recesses or zones around the tubes,introducing a fusible mixture in powdered condition between the gillswhen these are in a substantially horizontal position, vibrating theassembled parts so as to cause the fusible mixture to creep into thejointing recesses or zones and thereafter applying heat to melt thefusible mixture.

Signed at London England this 2nd day of April 1912.

WILLIAM JOSEPH STILL.

Witnesses:

CHARLES Cors, H. D. JAMISON.

